1. Post-graduate Program in Genetics and Molecular Biology, Department of Biosciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil;
2. INAGEMP – Instituto Nacional de Genética Médica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil;
3. Medical Genetics Service, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil